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INVESTMENT SECURITIES - Securities Pledged to Secure Borrowings and Public Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Washington, Oregon and California State to secure public deposits	$ 212,806	$ 206,153
Other securities pledged	2,011	5,258
Asset Pledged as Collateral without Right
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Total securities pledged as collateral	$ 214,817	$ 211,411

X

- Definition

Pledged Assets Not Separately Reported Securities Pledged For State and Local Governments.

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- Definition

Pledged Assets Separately Reported Other Securities Pledged

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No definition available.

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- Definition

[Line Items] for Schedule of Available-for-sale Securities and Held-to-maturity Securities [Table]

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Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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